[EMAIL PROTECTED] (Michael A. Miller) writes:
Dear R Gang,
I'm interested in using R and the nls package for fitting kinetic
models. I'm having some difficulty getting a model specified for
nls though. The math for the model that I want to fit is
dg(t)/dt = K1 f(t) - k2 g(t)
I did not know about stepsize being an issue. I had thought that
problems with convergence in this case were due to bad approximations of
the finite difference gradient. I guessed that around the optimum,
numerical errors would come to dominate the gradient calculations,
causing convergence to
